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Windows 2.0 also introduced more sophisticated keyboard shortcuts and could make use of expanded memory.

Windows 2.1 was released in two different versions: Windows/286 and Windows/386.

Unlike MS-DOS, Windows allowed users to execute multiple graphical applications at the same time, through cooperative multitasking.

Windows implemented an elaborate, segment-based, software virtual memory scheme, which allows it to run applications larger than available memory: code segments and resources are swapped in and thrown away when memory became scarce; data segments moved in memory when a given application had relinquished processor control.

The shell of Windows 1.0 is a program known as the MS-DOS Executive. Only modal dialog boxes may appear over other windows.

Components included Calculator, Calendar, Cardfile, Clipboard viewer, Clock, Control Panel, Notepad, Paint, Reversi, Terminal and Write. Microsoft sold as included Windows Development libraries with the C development environment, which included numerous windows samples.

The early versions of Windows are often thought of as graphical shells, mostly because they ran on top of MS-DOS and use it for file system services.

In addition to full Windows-packages, there were runtime-only versions that shipped with early Windows software from third parties and made it possible to run their Windows software on MS-DOS and without the full Windows feature set.Microsoft rewrote critical operations from C into assembly.Windows 3.0 is the first Microsoft Windows version to achieve broad commercial success, selling 2 million copies in the first six months.They run inside the same address space, where the segmented memory provides a degree of protection.Windows 3.0 also featured improvements to the user interface.

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